Pressure-regulating device for pneumatic tires.



0. J. BROSNAN PRESSURE REGULATING DEVICE FOR PNEUMATIC TIRES.

APPLIOATION FILED AUG. 31, 1906.

Patented June 14,1910.

vwewtoz 1 T. wits Lamas MMW ZQ ZQWP,

vices for sans an as.

COBNELIUSJ'. BROSNAN, 0F SPRINGFIELD, MASSACHUSETTS, ASSIGNOB OFONE-HALF TO ALLEN WEBSTER, OF SP RINGFIELD, MASSACHUSETTS.

PRESSURE-REGULATING DEVICE FOR PNEUMATIC TIRES.

Specification of Letters Patent. Fata -ted June 14, 310,

Application filed August 31, 1906. Serial No. 332,810.

tain conditions which are liable to occur,"

both in excessive pressure being produced when expanding the tire, andmore generally by reason of the excessive pressure developed by reasonof the heating of the air in tration of my invention, I have shown it asthe tlre caused by continuous running of the wheel. It is well knownthat the bursting of a tire while the machine is running is liable tocause serious and dangerous accidents.

The object of m invention is to provide a device which, w ile being simle in construction, inexpensive in cost 0 manufacture and reasonablycertain of operation, will prevent any excessive pressure in a neumatictire so that danger of bursting y reason of excessive pressure may beentirely avoided.

The object of my invention is, further, to provide a-device by theemployment of whlch air pressure in a pneumatic tire may be preventedfrom exceeding a certain predetermined amount, which device may beadjusted to various different pressures.

My object is, further, to provide a device.

which may be mounted upon the ordinary inlet tube now in common use withpneu-' matic tires, thus avoiding the. expense of placing a new ordiiferent tube in position.

I accomplish the objects of my invention hp the construction hereindescribed and il ustrated in the drawings.

In the accompanying drawings, in which like, letters of referenceindicate like parts, Figure 1 is a vertical sectional view of thepreferred form of embodiment of my invention; Fig. 2 is a view of theoutlet valve disk with its hollow stem attached; Fig. 3 is a view of theinlet valve and its stem, and Fig is a sectional view on a reduced scaleof a tire and rim with my device attached thereto, the usual inlet valvebeing shown in position and held open by the stem of the inlet valvewhich constitutes one of the new features of said device.

In detail, a indicates an outer shell or case; b a valve seat therein; 0a valve disk; 03 packing arranged between the disk and seat; 6 a hollowstem attached to the valve disk 0 and projecting case; 7 a coil spring;9 a regulating plug; h an inlet valve disk; 2' inlet iwalve disk stem; jinlet valve spring; lcordinary inletvalve tube in common use withpneumatic tires; l cap.

The construction and operation of my device will be readily understoodon reference to the drawings in connectionherewith.

In carrying out an embodiment or illusconstructed and adapted to beemployed in connection with an ordinary inlet valve n and its supportingtube is which is Well known and in common use with all pneumatic tires.This tube is is connected with upwardly through the a tire 0 and a rimor felly p by means of a nipple q or in any other suitable manner.

I'provide an outer shell or. case a, the lower end of which is threadedto engage the thread on the tube is. The case a is provided with a sring receivin chamber, as shown, and the ower end of 51c chamber isprovided with a valve seat I) which seat I, bypreference, construct asshown, as projeeting upwardly presenting a narrow circle to engage thepacking between it and the valve disk 0. The valve disk 0 is providedwith a hollow stem e projecting. upwardly through the adjusting plug g,and a coil spring f is mounted in the case between the valve disk 0 andthe inner end of the adjusting plug 9 so that the pressure on the valvedisk 0 may be varied by turning the adjustin plug g, the latter havingscrew threade connection with the case a as shown.

It will now readily be seen that if the conduit be 0 en from the tirechamber to the outlet va ve disk 0, and if the o ening through the valvedisk 0 be close that then when-the pressure in the pneumatic tireexceeds the pressure exerted y the sprin f on the valve disk 0, thisdisk will be raised from its seatand the air will escape around thevalve disk 0, between it and the inside face of the case a, andoutwardly between the plug 9 and the stem 0. For convenience in forcingair into the tire I provide a suplementary valve comprising a valve diskIt iiaving a valve seat or ring pro ectmgupwardly, and which valve diskIt lsprovided with a stem i projecting upwardly through the opening inthe stem e, and downwardly remove the valve mechanism entirely from thetube is I prefer for several reasons to leave the valve mechanism in thetube is and to project the stem 11 downwardly a sufiicient' distance sothat when the case a is in place the lower end 'of the stem 5 will bearagainst the stem m, it being the stem attached to said valve n, and holdthis valve openas illustrated in Fig. 4 during the time the case ais'inposition. The spring j, which normally retains the disk It against theside of the disk 0, is

' interposed between said disk It and a shoulder 8 in the case a, thebase of said s ring bearing on said shoulder and the top 0 said springbearing against the bottom of the dlsk it. When, however, the case a isremoved, even if the tire be expanded and under pressure, the valve inthe tube is will operate to prevent the escape of the air from the tiresothat the additional labor of forcing air into the tire will be avoidedand the pressure will not be materially reduced because of the removalof my safety appliance. The outer end of the tubular stem 6 is threadedto receive the. thread of an ordinary air pump, or other air conduit,and when it is desired to introduce air into the tire 0 the cap Z isremoved, the air conduit connected to the hollow stem 6, and uponpressure being applied the air will be forced down through the hollow.stem e forcing the valve disk It away from its seat, thus providing anopening for the passa e of the air throu h the conduit into the tirechamber. It wil be seen, however, that when the pressure in the tireexceeds the pressure exerted by the coil spring against the valve disk 0that this valve isk will be raised from its seat and the surplus. willescape around the disk and out through the opening in the adjusting plug9 so that if the plug 9' be screwed down so as to cause the spring toexert a certain pressure upon the outlet valve disk 0 then no greaterpressure can be forced into the tire, and dan er from excessive ressurewill therefore e completely avoide It will also be seen that if thetire, when cool and not in use, be exanded with a certain air ressure,using or illustration eighty poun s to the square inch which is quitecommon, and then the in the case below themachine be run until the tirebecomes heated and the air in the tire'is heated and expandednotwithstanding'the fact that the raising of the valve disk 0 from itsseat and allow the excess to escape as before described so that dangerof rupture of the tire by reason of excessive pressure will at all timesbe avoided.

I refer to employ soft rubber as a packing etween the valve disks andthe seat.

It will readily be seen that the shape of the parts and details ofconstruction in vari ous and many respects may be alteredwithoutdeparting from my invention. I do not therefore limit myself to thedetails of con i struction herein illustrated, but simply employ thesame as illustrating one embodiment of, and as at present advised, thebest form of construction.

Having therefore described my invention, what I claim and desire tosecure by Letters Patent, is-

1. The combination, with a wheel havin a pneumatic tire, an inlet valveconnecte with the tire, asupplementary inlet valve arranged to hold thefirst inlet valve open while the supplementary inlet valve is in place,an outlet valve, and a spring to hold the outlet yalve closed.

2. The combination, with a wheel and pneumatic tire, of a tube connectedwith said tire having an inlet valve therein, and a case mounted on saidtube and having an inlet and an outlet valve therein, the inlet valvestems being contiguous and the inlet and outlet valves in the case beingcontigu-' ous.

3. The combination, with a wheel having a pneumatic tire, of a suitablecase connected with the tire chamber, an outlet valve mounted in saidcase, an inlet valve mounted on the outlet valve disk, a spring to forcethe outlet valve upon its seat, means to regulate the pressure on saidspring, and a spring to force the inlet valve disk against the outletvalve disk.

4. A safety valve device for pneumatic tires, comprising a suitable casehaving a valve seat 6 therein provided with an annular channel, aspring-pressed outlet, valve disk forming a combination valve and valveseat adapted to rest on said first-mentioned seat and having a hollowstem e connected therewith projecting outwardly and having a centralopening therethrough, an inlet valve disk it mounted on the inner faceor seat of the outlet valve disk, a rod connected with the inlet valvedisk and movable therewith, and a spring as 7' to force the inlet valvedisk normally to its seat, said inlet valve being movable inwardlyagainst the leading same? force of its spring by pressure on the outer:end of said rod as well as by pressure of air when the same is forcedinto the stem, substantially as shown.

5. In a safety valve device for pneumatic tires, thecombination with atire, of an outlet valve and a spring therefor, means to vary thepressure of the spring, a conduit from the outlet valve to the interiorofthe tire, an inlet valve mounted to bear against the lower or innerface of the outlet valve disk, a spring arranged to force the inletvalve disk against the outlet valve disk, and a rod connected with theinlet valve disk from which it projects downwardly or inwardly and alsopasses through the outlet valve disk, said rod being free to move withthe inlet valve when opened for the passage of air into the tire and tomove also with the inlet "alve disk when it and the outlet valve movetogether to allow the escape of air outwar 1y.

6. A safety valve device for pneumatic tires, comprising a suitable casehaving a valve seat 12 therein provided with an annular channel, aspring-pressed outlet valve disk having a soft packing adapted to reston f the rim of said channel, a hollow stem 6 extendin outwardly fromone side only of said dlsk, an inlet valve disk It having an annularrim, a spring arranged to hold said disk h with its rim against saidpacking, and a rod connected with the inlet valve disk and extendingbeyond both faces thereof.

CORNELIUS J. BROSNAN.

"Witnesses:

ALLEN WEBSTER, JOSEPHINE M. Swans. v

